JPH0527103U - Vehicle test course road - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a test course with conditions close to the actual road surface. [Structure] An asphalt mixture obtained by mixing asphalt 7, coarse aggregates mainly composed of cobblestones 9 and fine aggregates such as sand 11 in a predetermined ratio is spread on the upper surface of the roadbed 1 and spread on the asphalt pavement layer 5 And the boulders 9 are exposed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 This invention relates to a vehicle test course road.

[0002]

[Prior Art]

 Generally, a test course road is used to examine the braking performance and tire performance of a vehicle.

[0003] The test course road is required to have a low μ road condition with a slip resistance value of about 0.2 to 0.5. For example, the surface of asphalt pavement or concrete pavement may be covered with polymer cement or synthetic resin. The resin material is applied, or the surface of concrete is polished to obtain a predetermined low μ road.

[0004]

[Problems to be solved by the device]

 As described above, the conventional test course road is artificially made to realize a low μ road.

In particular, on a low μ road of general asphalt pavement, for example, soft asphalt components and asphalt mortar components that are soft in nature are scraped off, and gravel, which is coarse aggregate, is exposed. This gravel will give a low-μ road with its surface polished and slippery by a tire, and the conditions will be quite different from the artificially made test course road. For this reason, it was difficult to obtain accurate data along the actual road surface on conventional test course roads.

In view of this, it is an object of the present invention to provide a test course path from which data can be obtained along the actual road surface.

[0007]

[Means for Solving the Problems] In order to achieve the above object, according to the present invention, asphalt, coarse aggregates mainly composed of cobblestone, and fine aggregates such as sand are provided in a predetermined ratio. The mixed asphalt mixture is spread on the upper surface of the roadbed to form an asphalt pavement layer and the boulders are exposed.

[0008]

[Action]

 In this test course road, since the cobblestones of the asphalt mixture forming the asphalt pavement layer are exposed as in the case of ordinary roads, a low μ road along the actual road surface can be secured. Therefore, accurate data along the actual road surface can be obtained.

[0009]

【Example】

 Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings of FIGS.

In FIG. 1, the roadbed 1 and the asphalt pavement layer 5 of the test course road are respectively shown.

The asphalt pavement layer 5 is made by laying an asphalt mixture in which at least asphalt 7, coarse aggregate mainly composed of cobblestone 9 and fine aggregate such as sand 11 are mixed at a predetermined ratio. The boulders 9 that are coarse aggregate are exposed.

As a means for exposing the boulders 9, for example, the asphalt mixture is spread by an asphalt finisher or the like, and then the surface is flatly compressed by a load roller (not shown) as shown in FIG. After the construction, light oil is sprayed at 0.1 liter / m ² and cured for about half a day. After that, the surface is washed twice with water pressure using a high temperature hot water washer. Next, as shown in FIGS. 3 and 4, the rotating drum 15 of the surface treatment machine 13 is rotated while spraying water, and the rubber chips and the brushes 17 provided at the tip of the rotating drum 15 remove asphalt and asphalt mortar. It is exposed by being removed.

However, the boulders 9 exposed on the surface of the asphalt pavement layer 5 in the test course road thus constructed are polished by the rubber chips and the brushes 17 to obtain a low μ road under the condition close to the actual road surface. Will be available.

By the way, as for the blending ratio of the asphalt mixture, for example, 60% of cobblestone, 15% of crushed stone No. 7 to adjust the sliding level, 15% of sand, 5% of stone powder, 4,1% of asphalt, the dynamic fruction tester ( As a result of measuring the slip resistance value using DFT, a value of DFT64 = 0.37 was obtained.

In this case, a desired slip resistance value can be obtained by changing the mixing ratio.

[0016]

[Effect of the device]

 As described above, according to the test course road of the present invention, it is possible to secure a low μ road close to the actual road surface, so that good and accurate data can be obtained.

Further, since it is an asphalt pavement layer, it has a merit that the construction period is short, the construction cost is low, and the repair is easy.

[Brief description of drawings]

FIG. 1 is a sectional view of a test course road of the present invention.

FIG. 2 is a cross-sectional view of an asphalt pavement layer before completion.

FIG. 3 is a side view of the surface treatment machine.

FIG. 4 is an enlarged side view showing a rubber chip provided at the tip of a rotary drum.

[Explanation of symbols]

 1 Roadbed 5 Asphalt pavement layer 7 Asphalt 9 Cobblestone 11 Sand

Claims (1)

[Scope of utility model registration request] 1. An asphalt mixture obtained by mixing asphalt, coarse aggregate mainly composed of cobblestone, and fine aggregate such as sand in a predetermined ratio is spread on the upper surface of a roadbed to form an asphalt pavement layer. A test course road for a vehicle, characterized in that the cobbles are exposed together.